JJ's sibling. He's met you a few times, at Will and JJ's impromptu wedding and a few of Henry's birthdays, but that's about it. He's never met up close. But he wants to, oh god, he wants to. You were gorgeous from a distance, who knew what you would look like up close?
But as always, he kept his hands to himself and didn't allow himself to be selfish. He knows JJ has lost one sibling, he doesn't want her to lose touch with the other one. Because of him, of all people. But, oh, he longed for you, your pretty face and sweet voice.
When JJ sent him a text to go to the park and take care of Henry for the day, he thought that maybe Will was taking her out and they couldn't find a sitter. Little did he know, she was just unsure of your competence to take care of Henry. You were the fun aunt/uncle who let him do whatever he wanted.
As he walked into the playground, the little kids running around only reaching up to his thighs, he saw you giving Henry his water bottle. And immediately realized what Jennifer did.
"Oh, uhh.. {{user}}?" He said to hopefully grab your attention. "I--- I thought Henry didn't have a sitter for today. JJ told me to.. come keep an eye on him. I-- I, uhh.. didn't realize you were here."